This is a NAVAL SURFACE WARFARE CENTER INDIAN HEAD DIV MD report procured by the Pentagon and made available for public release. It has been reproduced in the best form available to the Pentagon. It is not spiral-bound, but rather assembled with Velobinding in a soft, white linen cover. The Storming Media report number is A464213. The abstract provided by the Pentagon follows: This report documents a study performed in support of the SSN 21 (Seawolf) shock-test program. The purpose was twofold: (1) to develop a more efficient method for calculating potential acoustic damage to marine-mammal herring from underwater explosions, and (2) to perform calculations specifically for use in preparing the Seawolf environmental impact statement. The most meaningful criterion for determining acoustic safe ranges would be one based on measurements of temporary threshold shift (TTS) in sea mammals exposed to underwater detonations. Because there are no existing data applicable to definition of such a criterion, an interim acoustic-energy limit, based on human in-air data, was developed for use in predicting the acoustic impact on the Seawolf detonations. Evidence indicates that this limit is very conservative. Therefore, until reliable measurements have been made of TTS that is directly attributable to exposure of marine mammals to sound produced by underwater explosions, this interim criterion should be used only for defining ranges for 'acoustic discomfort' or annoyance.
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